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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe12b16f448f6bad301635248c0404faf424dc45e8a86236d45c0dee8b985370' 
  AND token = 'ejrFmyJpwp/h9Qfw4pHbumuvyJMwjPdq9zMcX2rI3zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}